(D) The ground state electronic configuration of carbon $(Z=6)$ is $1s^2, 2s^2, 2p_x^1, 2p_y^1$.In the excited state,one electron from the $2s$ orbita

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(D) The ground state electronic configuration of carbon $(Z=6)$ is $1s^2, 2s^2, 2p_x^1, 2p_y^1$.In the excited state,one electron from the $2s$ orbital is promoted to the empty $2p_z$ orbital.The excited state electronic configuration becomes $1s^2, 2s^1, 2p_x^1, 2p_y^1, 2p_z^1$.Therefore,the number of unpaired electrons in the excited state is $4$.